Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

Постоянный URI для этого сообществаhttps://cris.qyzpu.kz/handle/123456789/1

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Автор: search.filters.author.Ainur KhairullinaТема: search.filters.subject.activation energy

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    Тип записи:Публикация,
    DEVELOPMENT OF COMPOSITE ALUMINUM POWDERS WITH ENHANCED THERMOREACTIVITY FOR ENERGETIC SYSTEMS
    (2025-09-30)
    Aida Artykbayeva
    ;
    Ainur Khairullina
    ;
    А. Е. Баккара
    ;
    Б. С. Садыков
    ;
    Anar Zhapekova
    Introduction. In contemporary composite solid propellants, aluminum serves as a key energetic constituent; however, a passivating Al₂O₃ film on the particle surface markedly diminishes its effective reactivity. The present study aims to enhance the reaction performance of aluminum powder through mechanochemical treatment (MCT) employing functional modifiers. Commercial ASD-grade aluminum powder and GL-1 graphite were selected as the starting materials. Results and discussion. Within the experimental program, the aluminum powder was subjected to MCT with varying graphite loadings. The treatment dramatically increased the fraction of active aluminum owing to partial disruption of the oxide shell. Morphological examinations confirmed oxide removal, uniform graphite coating, and the emergence of lamellar structures measuring 20-80 nm. Thermal analysis further revealed a shift of the principal exothermic peak from 662.6 °C to 653.9 °C for the Al + 10% graphite composite, accompanied by a 27 % rise in heat release, indicative of a lower activation energy and more complete oxidation. Conversely, a 20% graphite addition reduced the thermal gain, as excess carbon shielded metallic sites. Conclusion. The graphite content of 10% is deemed optimal, providing the most favorable thermochemical behavior. The obtained results confirm that MCT of aluminum powder with graphite is an effective strategy for substantially increasing its reaction capability.
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    Creation of Modified Aluminum Powders with Increased Reactivity for Energy Systems
    (Multidisciplinary Digital Publishing Institute, 2025-10-14)
    А. Е. Баккара
    ;
    Ainur Khairullina
    ;
    Aida Artykbayeva
    ;
    Alua Maten
    ;
    Aizhan Nugymanova
    Aluminium plays a key role in developing modern energy technologies, from electrical systems to high-energy materials, providing a combination of functionality, economy, and reliability, but the oxide film on its particles reduces the effective reactivity. This work aims to increase the reactivity of aluminum powder by mechanochemical treatment using modifiers. The materials used were aluminum powder of the ASD brand and graphite of the GL-1 brand. The experiment subjected aluminum powder to mechanochemical treatment (MCT) with different graphite contents. It was shown that MCT significantly increases active aluminum content in the powder due to partial destruction of the oxide film on its surface. In addition, morphological analyses confirm the destruction of the oxide, the graphite coating, and the appearance of lamellar structures measuring 0–58 µm. Thermal analysis shows that the primary exothermic peak shifts from 662.6 °C to 653.9 °C for Al + 10% graphite, and the heat released increases by 27%, which means lower activation energy and more complete oxidation. However, at 20% graphite, the thermal gain decreases, since carbon shields the metal areas. Thus, the optimal content is 10% graphite: at this ratio, the best thermochemical behavior of the powder is achieved. The data obtained indicate that the MCT of aluminum powder with graphite effectively increases its reactivity. The resulting aluminum powders with modified particle surfaces facilitate the development of new technologies for the creation of various high-energy solid propellant systems. For rocket engines, preference is given to solid rocket propellant (SRP), which is a mixture of substances (components) capable of burning in the absence of air, producing a large amount of gaseous working fluid heated to a high temperature, providing thrust.
    Цитирования (OpenAlex) 1